The document describes Siemens' 3WT Air Circuit Breaker, which offers: 1) Flexibility with new electronic trip units (ETUs) and two frame sizes that cover a broad range of applications up to 66 kA at 500V. 2) Ease of use through user-friendly planning, configuration, installation and operation, as well as a wide range of accessories that can be retrofitted. 3) Safety and reliability through global quality processes that ensure high product quality and conformance to international standards and approvals.

1. Simply smart:
First choice for your applications
3WT Air Circuit Breaker
Answers for industry. s

2. Overview
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1 Air circuit breaker Highlights at a glance
2 Shutter Flexibility
3 Closing solenoid, auxiliary trip unit • New electronic trip units (ETUs) with outstanding
features
4 Auxiliary conductor plug-in system • Only two frame sizes cover a broad range of
5 Auxiliary switch block applications up to 66 kA at 500 V, 3- or 4-pole
version, fixed-mounted or withdrawable design
6 Door sealing frame
7 EMERGENCY-STOP pushbutton, key-operated Ease of use
• User-friendliness in planning, configuration,
8 Motorized operating mechanism installation and operation
9 Operating cycles counter • Wide range of same accessories for both frame
sizes can be easily retrofitted
10 Manual tester for electronic trip unit (ETU) • Displays for all electronic trip units (ETUs)
11 Microprocessor based electronic trip unit (ETU)
Safety and reliability
12 Guide frame • Global and standardized processes ensure highest
13 Main connection, front, horizontal, vertical product quality
• Conforms to international standards and
approvals
2

3. 3WT Air Circuit Breakers LC D display
Standard
Efficient and modular
The larger the plant, the greater the power distribution requirements. This is true for both industrial plants and
infrastructure projects, which depend on high availability, performance and reliability of their machines and
systems – today and over the entire life cycle.
Siemens offers you an easy way to meet these challenges. Our 3WT Air Circuit Breakers cover the entire range with
just two frame sizes and a broad range of modular accessories. Regardless of which version you choose, you will
benefit from a cost-efficient and highly reliable solution.
All ETUs with display and superior features
Type ETU35WT ETU37WT ETU45WT ETU47WT
Overload protection L
Short-time delayed short-circuit protection S
Instantaneous short-circuit protection I fixed fixed
Ground fault protection G – –
Neutral conductor protection (on/off) N –
LC display for current and trip information
LED display status indication
Active, overload alarm, T.U. error indication
Motor protection
Internal self-test
Front connection of the test device
Current measuring with Rogowski coils
: Available, – : Not available
Technical features
• Fixed-mounted and withdrawable
design
• 3- and 4-pole version
• High breaking capacity
• Wide range of same accessories
• Excellent electronic trip units (ETUs)
with displays
• Ready-to-close indicator
• No derating up to 50 °C
• Conforms to IEC and CCC standards
• State-of-the-art appearance
3

4. Technical specifications
Size I II
Type 3WT8 06 3WT8 08 3WT8 10 3WT8 12 3WT8 16 3WT8 20 3WT8 25 3WT8 32
Rated current ln at 50 °C Main conductor A 630 800 1000 1250 1600 2000 2500 3200
at 50 / 60 Hz Neutral conductor A 630 800 1000 1250 1600 2000 2500 3200
(only on 4-pole version)
Rated operational voltage Ue at 50 / 60 Hz AC V up to 500 up to 500
Rated insulation voltage Ui at 50 / 60 Hz AC V 1000 1000
Rated impulse Main circuits kV 8 8
withstand voltage Uimp Auxiliary circuits kV 4 4
Rated service short-circuit up to 500 V AC kA 66 66 66
breaking capacity Ics (rms value)
Rated short-time up to 500 V AC
withstand current Icw at 50 / 60 Hz (1 s) kA 50 50 66
Endurance mechanical Operating 16000 12000
electrical cycles 10000 4000
Operating frequency opn/hr 60 60
Power Loss at In Fixed W 40 60 90 120 140 170 325 420
(with 3 phase symmetrical load) Withdrawable W 80 130 205 255 310 310 535 760
Degree of protection IP 40* IP 40*
Dimensions A mm 3P /4P 320 / 420 410 / 540
B mm 470 470
C mm Fix / DO 330 / 398 330 / 398
Weights 3-pole Fixed-mounted circuit breaker 34 34 34 34 36 57 57 61
(weight of circuit breakers approx. kg
withdrawable Withdrawable circuit breaker 36 36 36 36 38 59 59 63
breaker given approx. kg
here is exclusive Guide frame approx. kg 22 22 22 22 23 35 35 37
of guide frame)
4-pole Fixed-mounted circuit breake 47 47 47 47 49 70 70 74
circuit breakers approx. kg
Withdrawable circuit breaker 49 49 49 49 51 72 72 76
approx. kg
Guide frame approx. kg 27 27 27 27 28 46 46 48
* IP 55 available on request
Highly efficient and economical:
3WT Air Circuit Breakers
Today, the economic success of industrial and infrastructure projects more than ever depends on the power supply – a key
aspect for availability, performance and productivity, and a lever to boost overall energy efficiency. That’s why choosing the
right circuit breakers is so crucial to keeping expenses down while, at the same time, optimizing performance.
With the new 3WT Air Circuit Breaker applications as well as in the area of same time it is highly user-friendly, while
(ACB), Siemens offers an economic and industrial switchgear technology, 3WT also offering a high degree of flexibility,
smart solution to protect transformers, circuit breakers can be used as incoming safety and reliability.
generators and low-voltage distribution and outgoing circuit breakers to distribute
systems. Both for infrastructure power in low-voltage switchgear. At the 3WT – simply smart.
4

5. Ordering Information
3-Pole 4-Pole
Fixed Mounted design Fixed Mounted design
Rated Standard Breaking Capacity Rated Standard Breaking Capacity
Size current Size current
In (A) Ics=100%Icu Order Code In (A) Ics=100%Icu Order Code
400 3WT8041- _ _ _ _ 0 - 0 A A 2 400 3WT8045- _ _ _ _ 0 - 0 A A 2
630 3WT8061- _ _ _ _ 0 - 0 A A 2 630 3WT8065- _ _ _ _ 0 - 0 A A 2
800 3WT8081- _ _ _ _ 0 - 0 A A 2 800 3WT8085- _ _ _ _ 0 - 0 A A 2
Size I 66 Size I 66
1000 3WT8101- _ _ _ _ 0 - 0 A A 2 1000 3WT8105- _ _ _ _ 0 - 0 A A 2
1250 3WT8121- _ _ _ _ 0 - 0 A A 2 1250 3WT8125- _ _ _ _ 0 - 0 A A 2
1600 3WT8161- _ _ _ _ 0 - 0 A A 2 1600 3WT8165- _ _ _ _ 0 - 0 A A 2
2000 3WT8202- _ _ _ _ 0 - 0 A A 2 2000 3WT8206- _ _ _ _ 0 - 0 A A 2
Size II 2500 66 3WT8252- _ _ _ _ 0 - 0 A A 2 Size II 2500 66 3WT8256- _ _ _ _ 0 - 0 A A 2
3200 3WT8322- _ _ _ _ 0 - 0 A A 2 3200 3WT8326- _ _ _ _ 0 - 0 A A 2
Withdrawable design with Guide Frame Withdrawable design with Guide Frame
Rated Standard Breaking Capacity Rated Standard Breaking Capacity
Size current Size current
In (A) Ics=100%Icu Order Code In (A) Ics=100%Icu Order Code
400 3WT8041- _ _ _ _ 4 - 5 A B 2 400 3WT8045- _ _ _ _ 4 - 5 A B 2
630 3WT8061 _ _ _ _ 4 - 5 A B 2 630 3WT8065- _ _ _ _ 4 - 5 A B 2
800 3WT8081- _ _ _ _ 4 - 5 A B 2 800 3WT8085- _ _ _ _ 4 - 5 A B 2
Size I 66 Size I 66
1000 3WT8101- _ _ _ _ 4 - 5 A B 2 1000 3WT8105- _ _ _ _ 4 - 5 A B 2
1250 3WT8121- _ _ _ _ 4 - 5 A B 2 1250 3WT8125- _ _ _ _ 4 - 5 A B 2
1600 3WT8161- _ _ _ _ 4 - 5 A B 2 1600 3WT8165- _ _ _ _ 4 - 5 A B 2
2000 3WT8202- _ _ _ _ 4 - 5 A B 2 2000 3WT8206- _ _ _ _ 4 - 5 A B 2
Size II 2500 66 3WT8252- _ _ _ _ 4 - 5 A B 2 Size II 2500 66 3WT8256- _ _ _ _ 4 - 5 A B 2
3200 3WT8322- _ _ _ _ 4 - 5 A B 2 3200 3WT8326- _ _ _ _ 4 - 5 A B 2
Electronic Trip Units
ETU35WT: protection function LSI + display 5 5
ETU37WT: protection function LSING1) + display 6 6
ETU45WT: protection function LSIN1) + display 7 7
ETU47WT: protection function LSING1) + display 8 8
Manual operating Mechanism AA 0 AA 0
Motorized Operating Mechanism UA 3 UA 3
(220VAC/DC Motor, 220V AC/DC shunt release,
220V AC/DC Closing solenoid included)
1)
CT for N-conductor shall be ordered separately
Order Codes given here are for HH terminal as standard. Standard accessories included: Safety Shutter(EDO/ MDO), sealing cap over OFF button(EDO/
MDO), door sealing frame, release transparent cover, trip signalling contact, ready to close signalling contact, auxiliary contacts 2NO+2NC
For further details please contact your nearest Siemens partner.
5

6. Your partners
Sales offices:
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Siemens Ltd. Order No.: 102237820
Industry Sector SGR-01-115-021
LV Control & Distribution Products (This replaces SGR-01-115-020)
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